Hydrogen storage container

Abstract

The invention belongs to the technical field of solid hydrogen storage, and particularly relates to a hydrogen storage container. The hydrogen storage container comprises a pot body and a pot cover which are matched in a sealing mode, and a closed storage space used for storing particle hydrogen storage materials is formed in the pot body and the pot cover. The longitudinal section of the pot body is of an arc-shaped structure, and the arc center is located between the pot body and the pot cover. A hydrogen inlet pipe is hermetically arranged on the pot cover in a penetrating manner; the hydrogen inlet end of the hydrogen inlet pipe is located outside the pot cover, and the hydrogen outlet end of the hydrogen inlet pipe is located in the storage space and faces the inner wall of the pot body. The invention solves the problem of how to improve the maximum effective specific surface area of the hydrogen storage material in the hydrogen storage container in the hydrogen absorption process while avoiding the stress damage to the container, thereby being beneficial to the adsorption of hydrogen.

Description

Technical Field

[0001] The invention belongs to the technical field of solid-state hydrogen storage, and in particular relates to a hydrogen storage container. Background Art

[0002] Solid-state hydrogen storage technology is considered a key development direction in the field of hydrogen storage due to its high hydrogen storage density, low pressure requirement, excellent safety and high purity of hydrogen. However, this technology involves significant heat exchange during the hydrogen charging and discharging process. If effective heat dissipation or heating treatment is not carried out in time, it will directly affect the continuity of the hydrogen charging and discharging operations. In addition, the volume expansion of the material after hydrogen absorption may cause concentrated stress damage to the container, and the existing container design has not yet provided sufficient protection measures for this.

[0003] In response to the above challenges, a technical solution with Chinese patent application number 202110669632.7 came into being, which discloses a solid-state hydrogen storage tank designed specifically for magnesium-based hydrogen storage. This tank body not only integrates a heat exchange box and a walking mechanism, but also cleverly arranges multiple hydrogen absorption tubes and air supply tubes on the side walls. Each hydrogen absorption tube is equipped with a propulsion temperature control mechanism to form a set of precision control system. By setting up multiple hydrogen absorption tubes, the increase in volume accompanying the hydrogen absorption process will squeeze the slider, causing it to push the pressure rod to move out of place, so that the pressure generated by the volume change process can be controlled. The effective distribution of the hydrogen absorption tubes allows the actual pressure to be evenly distributed, thereby effectively avoiding uneven force on the tank body, and avoiding stress concentration in the hydrogen absorption material during the hydrogen absorption expansion process, which can cause damage to the tank body.

[0004] In the above technical solution, when storing hydrogen, the hydrogen storage material is placed in the hydrogen absorption tube. The hydrogen storage material is generally in a granular structure (a granular structure is selected because of its large specific surface area). Due to the increase in volume during the hydrogen absorption process, the slider will be squeezed to move. Therefore, the hydrogen storage material in the hydrogen absorption tube will basically be in a horizontal stacking state. Otherwise, the hydrogen storage material cannot squeeze the slider to move when the volume increases. Under such stacking, hydrogen is transported through the design of the patented hydrogen absorption tube and the air supply tube. Although the stress damage of the hydrogen absorption material to the tank body is avoided to the greatest extent, it is difficult to ensure that the hydrogen is fully in contact with the hydrogen storage material when the hydrogen storage material absorbs hydrogen. The effective specific surface area cannot be maximized during hydrogen absorption, which is not conducive to the adsorption of hydrogen. Summary of the invention

[0005] In view of the above deficiencies in the prior art, the technical problem to be solved by the present invention is: how to increase the maximum effective specific surface area of ​​the hydrogen storage material in the hydrogen storage container during the hydrogen absorption process while avoiding stress damage to the container, thereby facilitating the adsorption of hydrogen.

[0006] The hydrogen storage container comprises a pot body and a pot cover which are sealed together, wherein the pot body and the pot cover form a sealed storage space for storing the granular hydrogen storage material; The longitudinal section of the pot body is an arc-shaped structure, and the center of the arc is located between the pot body and the pot cover; A hydrogen inlet pipe is sealed and passed through the pot cover; the hydrogen inlet end of the hydrogen inlet pipe is located outside the pot cover, and the hydrogen outlet end of the hydrogen inlet pipe is located in the storage space and faces the inner wall of the pot body.

[0007] Furthermore, the storage space is filled with spherical granular hydrogen storage material.

[0008] Furthermore, the hydrogen inlet pipe includes a first hydrogen inlet pipe and a second hydrogen inlet pipe which are vertically arranged and spaced apart. The first hydrogen inlet pipe and the second hydrogen inlet pipe are both sealed and installed on the pot cover. The hydrogen inlet ends of the first hydrogen inlet pipe and the second hydrogen inlet pipe are located on the outside of the pot cover. The hydrogen outlet ends of the first hydrogen inlet pipe and the second hydrogen inlet pipe are located in the storage space and face the inner wall of the pot body. The hydrogen outlet end of the second hydrogen inlet pipe is lower than the hydrogen outlet end of the first hydrogen inlet pipe.

[0009] Furthermore, the roughness of the inner surface of the pot body is less than 1-10 μm.

[0010] Furthermore, a jacket is provided on the outside of the pot body, a sealed heat exchange chamber is formed between the jacket and the pot body, a liquid outlet communicating with the heat exchange chamber is installed at the upper end of the jacket, and a liquid inlet communicating with the heat exchange chamber is installed at the lower end of the jacket.

[0011] Furthermore, a hydrogen outlet is provided on the top of the pot cover, and a hydrogen outlet pipe is sealed and installed at the hydrogen outlet.

[0012] Furthermore, there are multiple first hydrogen inlet pipes and multiple second hydrogen inlet pipes.

[0013] Furthermore, solenoid valves are installed at the hydrogen inlet ends of all the first hydrogen inlet pipes and the second hydrogen inlet pipes.

[0014] Furthermore, the air inlets of all the first hydrogen inlet pipes are connected to the same first gas supply branch pipe, and the air inlets of all the second hydrogen inlet pipes are connected to the same second gas supply branch pipe. The first gas supply branch pipe and the second gas supply branch pipe are connected by a metal hose, and the air inlet ends of the two metal hoses are connected to the hydrogen inlet main pipe through a three-way joint.

[0015] Furthermore, a skirt seat is provided below the pot body, and the pot body is mounted on the skirt seat.

[0016] Furthermore, a skirt seat is arranged below the pot body, the pot body is rotatably connected to the skirt seat, and a locking component for locking the pot body on the skirt seat is arranged at the hinge.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. Under the coordinated design of the hydrogen inlet pipe and the pot body, compared with the existing hydrogen storage material stored in the hydrogen absorption tube, the granular hydrogen storage material can be blown when hydrogen is input, which provides an environment for the hydrogen storage material to move when absorbing hydrogen. Compared with the existing hydrogen storage material stored in the hydrogen absorption tube to absorb hydrogen, the moving hydrogen storage material has a larger contact area with hydrogen, which is conducive to hydrogen absorption.

[0018] 2. This design uses a storage space formed by the sealed cooperation of the pot body and the pot cover, which facilitates the control of the amount of hydrogen storage material added and effectively utilizes the storage space. When using it, you only need to know the volume of the space and the expansion amount of the hydrogen storage material after absorbing hydrogen to obtain the amount of hydrogen storage material added to the space.

[0019] 3. This design uses spherical granular hydrogen storage materials, which is more conducive to blowing them through the hydrogen inlet pipe. In the process of blowing, some spherical particles will rotate, further increasing the contact area between hydrogen and the hydrogen storage material. In the case of motion, the stress generated by hydrogen absorption is better dispersed than in the static state, which can better solve the problem of avoiding stress damage to the container while maximizing the contact area, thereby promoting hydrogen adsorption.

[0020] 4. The present invention has high heat exchange efficiency under the jacket design. This design utilizes the principle of heat exchange jacket tanks in the existing chemical industry. Heat exchange medium can be added to the heat exchange cavity to cool or heat the tank body. Under the basic design of high heat exchange, due to the high gas fluidity, the hydrogen absorption of the hydrogen storage material in motion is greatly improved. At the same time, since the hydrogen storage material is in motion, heat transfer is also accelerated, which is beneficial to heat exchange.

[0021] 5. This design adopts the coordinated design of the first hydrogen inlet pipe and the second hydrogen inlet pipe. By utilizing the different heights of the hydrogen outlet ends of the first hydrogen inlet pipe and the second hydrogen inlet pipe, the hydrogen storage materials at different positions can be blown to further promote the movement of the hydrogen storage materials.

[0022] 6. The design of using a plurality of first hydrogen inlet pipes and second hydrogen inlet pipes can further blow the hydrogen storage materials at different positions, thereby accelerating the movement of the hydrogen storage materials.

[0023] 7. Under the design of the solenoid valve, it is convenient to adjust the flow rate of each first hydrogen inlet pipe and the second hydrogen inlet pipe. At the same time, by staggered control of the flow rate of each first hydrogen inlet pipe and the second hydrogen inlet pipe, the hydrogen storage material can be operated according to a certain trajectory. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 for Figure 1 A schematic diagram of a top view structure; Figure 3 for Figure 1 A right view structural diagram of ; Figure 4 for Figure 1 Schematic diagram of the cross-sectional structure along line AA; Figure 5 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 6 It is a schematic diagram of the three-dimensional structure of the present invention during unloading; Figure 7 It is a schematic diagram of the explosion structure of the present invention.

[0025] Figure numerals: 1. pot cover; 2. pressure gauge; 3. hydrogen outlet valve; 4. hydrogen outlet pipe; 5. solenoid valve; 6. metal hose; 7. three-way joint; 8. hydrogen inlet valve; 9. first hydrogen inlet pipe; 10. angle code; 11. screw; 12. stabilizer frame; 13. pot body; 14. jacket; 15. skirt; 16. liquid inlet; 17. second hydrogen inlet pipe; 18. liquid outlet; 19. rotating shaft; 20. three-way pipe; 21. safety valve; 22. thermometer; 23. hydrogen outlet. DETAILED DESCRIPTION

[0026] The present invention is further described below through specific embodiments in conjunction with the accompanying drawings, but the present invention is not limited thereto. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0027] Example 1 like Figures 1 to 7 As shown, a hydrogen storage container described in this embodiment includes a pot body 13 and a pot cover 1 that are sealed together. The pot cover 1 and the pot body 13 are connected in a detachable sealed installation manner, which is convenient for replacing hydrogen storage materials and daily maintenance. Of course, if the pot body 13 used is very large, then considering that the pot cover 1 will also become larger, it will be very troublesome during the disassembly process. At this time, a manhole can be designed on the pot cover 1. The design of the manhole refers to the tank or kettle with a manhole in the chemical industry.

[0028] like Figure 1 or Figure 7 As shown, the longitudinal section of the pot body 13 is an arc-shaped structure, and the arc center is located between the pot body 13 and the pot cover 1. The pot body 13 as a whole is like a round-bottomed pot used for cooking at home. In order to further improve the effect of dispersing hydrogen on the inner surface of the pot body 13, the present embodiment preferably has a roughness of the inner surface of the pot body 13 of less than 1 μm. The smaller the roughness, the smoother the inner surface of the pot body 13, the smaller the restriction on the movement of hydrogen storage particles, and the less likely they are to stay on the inner surface of the pot body 13. The stress dispersion transmission is faster, and the effect of dispersing hydrogen is better. In actual application, different roughness can be selected according to different processing conditions, such as 10 μm, 1.25, 3, 5, 6 or any value between 1 and 10 μm.

[0029] The pot body 13 and the pot cover 1 form a closed storage space for storing granular hydrogen storage materials. In this embodiment, the hydrogen storage material is preferably in the form of spherical particles, which is convenient for the movement of the hydrogen storage material, and there are many gaps between the particles, which is convenient for the adsorption of hydrogen.

[0030] The pot cover 1 is sealed with a hydrogen inlet pipe. Figure 2 As shown, in this embodiment, two first hydrogen inlet pipes 9 and second hydrogen inlet pipes 17 are selected as hydrogen inlet pipes. When used, their number can be determined according to the size of the pot body 13 and the quality of the hydrogen storage material. Of course, if the volume of the pot body 13 is small, one hydrogen inlet pipe can also be used. Ultimately, it is sufficient to allow the hydrogen storage material to perform a certain movement when absorbing hydrogen.

[0031] For convenience, a hydrogen outlet 23 is provided on the top of the pot cover 1, and a hydrogen outlet pipe 4 is sealed and installed at the hydrogen outlet 23, and a hydrogen outlet valve 3 is installed on the hydrogen outlet pipe 4. Of course, if the pot body 13 is small, the air inlet pipe can also be directly used as the hydrogen outlet pipe to achieve dual purposes. If the one pipe is used for dual purposes, the hydrogen inlet pipe and the hydrogen outlet 23 are detachably connected, usually in the form of a threaded connection.

[0032] The hydrogen inlet pipe includes a first hydrogen inlet pipe 9 and a second hydrogen inlet pipe 17 which are vertically arranged and spaced apart. The first hydrogen inlet pipe 9 and the second hydrogen inlet pipe 17 are both sealed and installed on the pot cover 1. The hydrogen inlet ends of the first hydrogen inlet pipe 9 and the second hydrogen inlet pipe 17 are located outside the pot cover 1. The hydrogen outlet ends of the first hydrogen inlet pipe 9 and the second hydrogen inlet pipe 17 are located in the storage space and face the inner wall of the pot body 13. The hydrogen outlet end of the second hydrogen inlet pipe 17 is lower than the hydrogen outlet end of the first hydrogen inlet pipe 9.

[0033] For the convenience of control, the air inlets of the two first hydrogen inlet pipes 9 are connected to the same first gas supply branch pipe, and the air inlets of the two second hydrogen inlet pipes 17 are connected to the same second gas supply branch pipe. The first gas supply branch pipe and the second gas supply branch pipe are connected by a metal hose 6. The air inlet ends of the two metal hoses 6 are connected to the hydrogen inlet main pipe through a three-way joint 7, and the hydrogen inlet main pipe is equipped with a hydrogen inlet valve 8. The inlet ends of all the first hydrogen inlet pipes 9 and the second hydrogen inlet pipes 17 are equipped with a solenoid valve 5. The solenoid valve 5 is opened when hydrogen is absorbed and closed when hydrogen is released. When connecting, since the present embodiment adopts two first hydrogen inlet pipes 9 and two second hydrogen inlet pipes 17, it can also be as follows Figure 2 As shown, two three-way pipes 20 are prepared, one for connecting the two first hydrogen inlet pipes 9, and the other for connecting the two second hydrogen inlet pipes 17. When connecting, the two first hydrogen inlet pipes 9 or the second hydrogen inlet pipes 17 are respectively connected to the two ports of the three-way pipe 20, and the third port of the three-way pipe 20 is connected to the metal hose 6.

[0034] In order to facilitate the placement of the pot body 13, a skirt seat 15 is provided below the pot body 13, and the pot body 13 is installed on the skirt seat 15. The design of the skirt seat 15 refers to the skirt seat of the tank in the chemical industry, and the usual skirt seat is a cylindrical structure.

[0035] When absorbing hydrogen, the hydrogen outlet valve 3 needs to be closed, the hydrogen inlet pipe is opened, and granular hydrogen storage materials are added to the storage space. When hydrogen is transported through the hydrogen inlet pipes (the first hydrogen inlet pipe 9 and the second hydrogen inlet pipe 17), the flow rate of hydrogen can be determined according to the quality of the hydrogen storage materials, as long as the hydrogen storage materials can be blown; when adjusting the hydrogen flow rate, the hydrogen storage materials are mainly moved in the storage space. For example, when the hydrogen storage materials are blown to the top of the pot cover, the flow rate of hydrogen needs to be reduced; when the storage materials are blown to the top of the pot cover, the flow rate of hydrogen needs to be reduced. When the hydrogen material is not blown away at the bottom of the pot body, it is necessary to increase the flow rate of hydrogen; when the hydrogen is blown onto the inner wall of the pot body 13, since the longitudinal cross-section of the pot body 13 is an arc-shaped structure, the pot body 13 as a whole is a curved surface structure, which can evenly disperse the hydrogen. At the same time, the contact between the hydrogen and the pot body 13 will also transfer the heat generated by the hydrogen storage material absorbing hydrogen in the storage space to the pot body 13. The pot body 13 will exchange the heat with the outside world. If necessary, the heat can be dissipated by blowing cold air onto the outer wall of the pot body.

[0036] When releasing hydrogen, the outer wall of the boiler is heated, the hydrogen outlet valve 3 is opened to release hydrogen, and the hydrogen inlet pipe is closed.

[0037] Example 2 This embodiment is further improved on the basis of embodiment 1. In order to facilitate the observation of hydrogen absorption effect and the checking of temperature, pressure, etc., the following technical solution is selected: 1. An observation window can be installed on the pot cover 1. The design of the observation window can refer to the observation windows on various tanks or kettles in the chemical industry, which is sometimes also called a sight window in the chemical industry.

[0038] 2. Install the pressure gauge 2 and the temperature gauge 22 on the top in sequence. When the pressure gauge 2 shows that the pressure is too high, the pressure can be reduced by reducing the amount of hydrogen entering the hydrogen inlet pipe; when the temperature gauge 22 is too high, it is necessary to increase the heat exchange rate, such as reducing the temperature of the heat exchange medium in the jacket 14 or increasing the flow rate.

[0039] 3. For safety, a safety valve 21 is installed on the pot cover 1. The safety valve 21 is also called a pressure relief valve in the reaction tank in the chemical industry. When the pressure in the pot body 13 is too high, if there is no timely treatment, the safety valve 21 will automatically open to relieve the pressure. These technologies are very common in the chemical industry and will not be described in detail here.

[0040] Example 3 Based on the first embodiment, the matching relationship between the pot body 13 and the skirt 15 is further optimized in this embodiment, and the specific description is as follows: In this embodiment, when the pot body 13 and the skirt 15 are installed, the pot body 13 is rotatably connected to the skirt 15, and a locking component for locking the pot body 13 on the skirt 15 is provided at the rotational connection. Common locking components include lock buckles, lock nuts, latch bolts, etc. Figure 1 As shown, the locking assembly includes an angle code 10 and a stabilizing frame 12. The stabilizing frame 12 is fixed on the skirt 15. One side of the angle code 10 is fixed on the pot body 13 or the jacket 14, and a through hole is opened on the other side. A screw 11 is installed in the through hole, and a threaded hole that is threadedly matched with the screw 11 is opened on the stabilizing frame 12. When fixing, the screw 11 passes through the through hole and matches with the threaded hole, so that the angle code 10 is fixed on the stabilizing frame 12. When the pot body 13 needs to be rotated, the screw 11 is removed.

[0041] Further explanation, the specific method of the rotation connection between the pot body 13 and the skirt 15 is: Figure 4 As shown, a rotating shaft 19 is horizontally fixed on both sides of the pot body 13, and a rotating hole for the rotating shaft 19 to be independently inserted is opened on the skirt seat 15 corresponding to the rotating shaft 19, and the rotating shaft 19 rotates in the rotating hole. If the pot body 13 is too heavy, the rotating shaft 19 can be installed on the skirt seat 15 through a bearing seat. There are many installation methods for such rotating connection, which will not be described in detail here. You can choose according to your needs later, as long as the rotating shaft 19 can rotate.

[0042] The pot body 13 and the skirt 15 are rotatably connected. When the hydrogen storage material needs to be replaced, Figure 6 As shown, it is only necessary to loosen the screw 11, disassemble the hydrogen outlet pipe 4 and the hydrogen inlet manifold on the pot cover 1, and then rotate the pot body 13, turn the pot cover 1 downward, and the pot body 13 upward, and then the hydrogen storage material can be discharged through the hydrogen outlet 23. When the hydrogen storage material is hardened, inert gas such as nitrogen can be filled into the storage space through the hydrogen inlet pipe to loosen the hydrogen storage material and unload the hydrogen storage material more smoothly from the hydrogen outlet 23. If the hardening is very serious, the pot cover 1 can be directly opened and replaced directly.

[0043] Example 4 This embodiment further improves the technology on the basis of the embodiment 1, and the improved technology mainly relates to the heat exchange technology of the pot body 13. The heat exchange technology is actually very common in many fields, especially the heat exchange technology on the reaction tank or reactor in the chemical industry.

[0044] This embodiment mainly refers to the jacketed heat exchange technology in the chemical industry. Specifically, a jacket 14 is sleeved on the outside of the pot body 13, and a sealed heat exchange chamber is formed between the jacket 14 and the pot body 13. A liquid outlet 18 communicating with the heat exchange chamber is installed at the upper end of the jacket 14, and a liquid inlet 16 communicating with the heat exchange chamber is installed at the lower end of the jacket 14.

[0045] At the same time, in order to further facilitate heat exchange, when applied, it is preferred to establish a cooling circulation system at the place where hydrogen is absorbed. When hydrogen is absorbed, the cooling medium (usually cooling brine) is injected into the heat exchange chamber through the liquid inlet 16 through the cooling system, and the cooling medium after heat exchange flows back to the cooling system from the liquid outlet 18; similarly, it is preferred to establish a heating circulation system at the place where hydrogen needs to be discharged or on the transport vehicle, and the heating medium (usually steam) is injected into the heat exchange chamber through the liquid inlet 16 through the heating system, and the heating medium after heat exchange flows back to the heating system from the liquid outlet 18. Both the cooling circulation system and the heating circulation system can refer to the technology in the chemical industry.

[0046] The design of the jacket 14 can refer to the tank or kettle with a jacket in the chemical industry, which is very common in the chemical industry, is easy to design, and has a good heat exchange effect.

Claims

1. A hydrogen storage container, comprising a pot body (13) and a pot cover (1) in a sealed fit, characterized in that: The pot body (13) and the pot cover (1) form a closed storage space for storing granular hydrogen storage materials; The longitudinal cross-section of the pot body (13) is an arc-shaped structure, and the center of the arc is located between the pot body (13) and the pot cover (1); A hydrogen inlet pipe is sealed and penetrated through the pot cover (1); the hydrogen inlet end of the hydrogen inlet pipe is located outside the pot cover (1), and the hydrogen outlet end of the hydrogen inlet pipe is located in the storage space and faces the inner wall of the pot body (13).

2. The hydrogen storage container according to claim 1, characterized in that: The storage space is filled with spherical granular hydrogen storage material.

3. The hydrogen storage container according to claim 1 or 2, characterized in that: The hydrogen inlet pipe comprises a first hydrogen inlet pipe (9) and a second hydrogen inlet pipe (17) which are arranged vertically and spaced apart from each other. The first hydrogen inlet pipe (9) and the second hydrogen inlet pipe (17) are both sealed and installed on the pot cover (1). The hydrogen inlet ends of the first hydrogen inlet pipe (9) and the second hydrogen inlet pipe (17) are located outside the pot cover (1). The hydrogen outlet ends of the first hydrogen inlet pipe (9) and the second hydrogen inlet pipe (17) are located in the storage space and face the inner wall of the pot body (13). The hydrogen outlet end of the second hydrogen inlet pipe (17) is lower than the hydrogen outlet end of the first hydrogen inlet pipe (9).

4. The hydrogen storage container according to claim 3, characterized in that: The roughness of the inner surface of the pot body (13) is less than 1 to 10 μm.

5. The hydrogen storage container according to claim 1, characterized in that: The top of the pot cover (1) is provided with a hydrogen outlet (23), and a hydrogen outlet pipe (4) is sealed and installed at the hydrogen outlet (23).

6. The hydrogen storage container according to claim 3, characterized in that: There are multiple first hydrogen inlet pipes (9) and multiple second hydrogen inlet pipes (17).

7. The hydrogen storage container according to claim 6, characterized in that: The hydrogen inlet ends of all the first hydrogen inlet pipes (9) and the second hydrogen inlet pipes (17) are equipped with solenoid valves (5).

8. The hydrogen storage container according to claim 7, characterized in that: The air inlets of all the first hydrogen inlet pipes (9) are connected to the same first gas supply branch pipe, and the air inlets of all the second hydrogen inlet pipes (17) are connected to the same second gas supply branch pipe. The first gas supply branch pipe and the second gas supply branch pipe are connected via a metal hose (6), and the air inlet ends of the two metal hoses (6) are connected to the hydrogen inlet main pipe via a three-way joint (7).

9. The hydrogen storage container according to claim 8, characterized in that: A skirt seat (15) is provided below the pot body (13), and the pot body (13) is mounted on the skirt seat (15).

10. The hydrogen storage container according to claim 8, characterized in that: A skirt seat (15) is provided below the pot body (13), the pot body (13) is rotatably connected to the skirt seat (15), and a locking component for locking the pot body (13) to the skirt seat (15) is provided at the hinge.

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